He's doing his homework, isn't he? she is cooking now, isnt she? they are tired, arent they? you are walking with a dog now, arent you? are you speaking on the phone, arent you?
Ну вообще, в некоторых предложениях можно несколько вариантов подставить. Поэтому надо уточнять задание, какие именно времена или типы кондишн использовать.
1) If she visit me, I will be glad. (или) If she visited me, I would be glad.
2) Tonight I will go to bed after I do my homework.
3) When the lessons finish, the teacher will give us marks.
4) If they come tomorrow, I will make a cake.
5) If you arrive late, you will miss your flight.
6) She will buy me a present if she go to Australia.
7) If you don't climb the tree, you won't see a bird.
8) If the weather doesn't change, the plane won't be on time.
9) We will see Big Ben if we travel to London.
10) If I don't have mistakes, I will get 10 ... (неполный пункт, мне кажется)
she is cooking now, isnt she?
they are tired, arent they?
you are walking with a dog now, arent you?
are you speaking on the phone, arent you?